Ricky tries to find out why some schools make such a big deal about you wearing school uniforms, in the second of a new series of special reports.
They're called 'Ricky Investigates', and they're all about giving you the chance to get Ricky and the Newsround team to look into things that you want answers to.
Paddy got in touch to see if Ricky could find out whether wearing school uniform makes a difference to how you learn.
So does it make a difference if you wear your own clothes to class? Over to Ricky...